package hu.u_szeged.inf.ovrt.filelister.core.utils;

/*
 * Copyright (C) 2001-2003 Colin Bell
 * colbell@users.sourceforge.net
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import java.text.NumberFormat;

/**
 * Class for formatting file sizes.
 *
 * @author Bandi
 *
 */

public final class SizeFormatter {
    private SizeFormatter() {

    }

    /**
     * Format the given file size value into a string.
     *
     * @param longSize The file size
     * @param decimalPos Number of decimal positions used for display
     * @return The formatted string
     */

    public static String formatSize(long longSize, int decimalPos) {
        String ret = null;
        NumberFormat fmt = NumberFormat.getNumberInstance();
        if (decimalPos >= 0) {
            fmt.setMaximumFractionDigits(decimalPos);
        }
        final double size = longSize;
        if (size / (1024 * 1024 * 1024) > 2) {
            ret = fmt.format(size / (1024 * 1024 * 1024)).concat(" GB");
        } else if (size / (1024 * 1024) > 2) {
            ret = fmt.format(size / (1024 * 1024)).concat(" MB");
        } else if (size / 1024 > 2) {
            ret = fmt.format(size / 1024).concat(" KB");
        } else {
            ret = fmt.format(size).concat(" B");
        }
        return ret;
    }
}
